MIT 8.20 Introduction to Special Relativity, January IAP 2021 Instructor: Markus Klute View the complete course: https://ocw.mit.edu/8-20IAP21 YouTube Playlist:    • MIT 8.20 Introduction to Special Rela...   We discuss the equivalence of gravitational and inertial mass as discovered  by Einstein. License: Creative Commons BY-NC-SA More information at https://ocw.mit.edu/terms More courses at https://ocw.mit.edu/ Support OCW at http://ow.ly/a1If50zVRlQ We encourage constructive comments and discussion on OCW’s YouTube and other social media channels. Personal attacks, hate speech, trolling, and inappropriate comments are not allowed and may be removed. More details at https://ocw.mit.edu/comments.